The Mil Mi-32 was a conceptual helicopter developed by the former Soviet Union in 1982. It was to be equipped with three rotors, with two engines driving each rotor. These engines were the same ones found in the smaller transport Mil Mi-26.
The Mi-32 would have used a peculiar triangular fuselage. It was designed to carry large, heavy loads. None were ever built.
References
Mil Mi-32 Wikipedia(Text) CC BY-SA